CN115356074A

CN115356074A - High-spatial-resolution movable type leather support pressure measurement rake and preparation method thereof

Info

Publication number: CN115356074A
Application number: CN202210961643.7A
Authority: CN
Inventors: 徐万武; 周乐天; 叶伟; 李智严; 张振康; 敬奇
Original assignee: National University of Defense Technology
Current assignee: National University of Defense Technology
Priority date: 2022-08-11
Filing date: 2022-08-11
Publication date: 2022-11-18
Anticipated expiration: 2042-08-11
Also published as: CN115356074B

Abstract

The invention relates to a high-spatial-resolution movable leather support pressure measurement rake and a preparation method thereof, wherein the leather support pressure measurement rake comprises the following components: the measuring rake is connected with a rake handle component; the measurement rake includes: the pressure probe is arranged on one side of the rake body in the width direction, and the guide pipe is arranged in the rake body; a plurality of pressure probes are arranged at equal intervals along the length direction of the rake body, one end of each pressure probe is bonded with the rake body, and the other end of each pressure probe freely extends along the direction far away from the rake body; the guide pipes are arranged in one-to-one correspondence with the pressure probes, one end of each guide pipe is communicated with the pressure probes, and the other end of each guide pipe can be selectively arranged at one end of the rake body in the length direction in an extending mode; the harrow handle component is connected with one end of the harrow body in the length direction. The invention is suitable for the fields of wind tunnel, ejector, engine and the like which need to carry out flow field detection, has the characteristic of high spatial resolution, and has the advantages of flexible movement, large detection range and high measurement efficiency.

Description

High-spatial-resolution movable type leather support pressure measurement rake and preparation method thereof

Technical Field

The invention relates to ultrasonic pipeline flow field detection, in particular to a high-spatial-resolution movable type Pitot pressure measurement rake and a preparation method thereof.

Background

The supersonic pipeline has the characteristics of complex flow field and narrow space, so that when the supersonic pipeline is measured, the adopted measuring equipment is easy to interfere the flow field, even the flow field is not started, and the performance of the equipment is influenced.

The traditional method for measuring the flow field of the ultrasonic ejector simulates the condition of a free shear layer through a large cavity arranged behind a spray pipe, so that a measurement rake is not arranged in a mixing chamber pipeline for measurement, but is arranged in the cavity for measurement, the influence of the measurement rake on the flow field can be reduced by reducing the blockage ratio of the area where the measurement rake is arranged, and the mode does not accord with the pipeline flowing phenomenon of the ejector under the real working condition. In the real supersonic pipeline flow, the impact effect on the measurement rake under the condition of starting needs to be considered for the measurement of relevant flow parameters, the mid-self-excited oscillation of the flow field can generate oscillation on the measurement rake when the flow field operates, so that the result of the measurement rake is distorted, and the problem of the angle between the main flow direction of the flow field and the lip of the measurement rake probe can also cause the result distortion and the like.

Therefore, in the conventional contact measurement, the measurement is performed basically in a free space type (i.e. airflow is guided into a larger space, flow velocity is reduced, and blockage ratio is reduced), a fixed single point type (only one or a plurality of probes are arranged and fixed in a flow field), a moving single point type (only one probe performs moving measurement in the flow field), a measurement rake is locally moved by a motor servo, and the like. However, these measurement methods have the disadvantage of distorted results.

Disclosure of Invention

The invention aims to provide a high-spatial-resolution movable type leather-support pressure measuring rake and a preparation method thereof.

To achieve the above object, the present invention provides a high spatial resolution mobile Pitot pressure measurement rake, comprising: the measuring rake is connected with a rake handle component;

the measurement rake includes: a plate-shaped rake body, a pressure probe provided on one side in the width direction of the rake body, and a duct provided in the rake body;

a plurality of pressure probes are arranged at equal intervals along the length direction of the rake body, one end of each pressure probe is bonded with the rake body, and the other end of each pressure probe freely extends along the direction far away from the rake body;

the guide pipes and the pressure probes are arranged in a one-to-one correspondence mode, one end of each guide pipe is communicated with the pressure probes, and the other end of each guide pipe can be selectively arranged at one end of the rake body in the length direction in a stretching mode;

the harrow handle component is connected with one end of the harrow body in the length direction.

According to one aspect of the invention, the clogging ratio of the measurement rake is less than 0.1.

According to one aspect of the invention, two sides of the rake body in the width direction are respectively provided with a diversion angle, and the diversion angles are as follows: 10 degrees to 30 degrees;

the thickness of the harrow body is as follows: 6 mm-8 mm.

According to one aspect of the invention, the ratio of the length l of the pressure probe to the probe outer diameter D is greater than 12;

the ratio of the center distance s between adjacent pressure probes to the outer diameter D of the probe is more than 5;

the inner diameter d of the pressure probe satisfies: d is more than 0.3mm and less than 1.0mm;

one end of the pressure probe, which is far away from the rake body, is a conical head, and the vertex angle of the conical head is less than 10 degrees, or one end of the pressure probe, which is far away from the rake body, is a blunt head,

according to an aspect of the invention, the rake body comprises: the device comprises a main body, a cover plate, a first side plate and a second side plate;

the main body is a plate-shaped body, one side of the main body in the width direction is provided with an installation channel for installing the pressure probe, and one side of the main body in the thickness direction is provided with an installation groove for accommodating the guide pipe;

the mounting channel is communicated with the mounting groove;

the cover plate is arranged in a shape consistent with the shape of the opening of the mounting groove on the main body and used for closing the mounting groove;

the mounting grooves are provided with openings at two opposite ends of the main body along the length direction of the main body;

the first side plate and the second side plate are respectively arranged at two opposite ends of the main body along the length direction of the main body;

the first side plate and the second side plate are provided with conduit channels for the conduits to extend out.

According to one aspect of the invention, the body comprises: the flow field infiltration part is used for installing the pressure probe, the transition part, the first clamping part and the second clamping part;

the transition parts are respectively arranged at two opposite ends of the flow field soaking part;

the first clamping part and the second clamping part are respectively connected with the flow field wetting part through the transition part;

the cross-sectional shapes of the first clamping part, the transition part and the flow field wetting part are kept consistent;

the cross section of the second clamping part is rectangular;

along the thickness direction of main part, be provided with the position scale on the side of transition portion, just the position scale is followed the length direction of transition portion arranges the setting.

According to an aspect of the invention, further comprising: a moving assembly;

the moving assembly is detachably connected with the harrow handle assembly;

the moving assembly includes: the device comprises a connecting body, a spiral transmission device rotationally connected with the connecting body, a connecting bracket connected with the connecting body, and a guide rail connected with the connecting bracket in a sliding manner;

the spiral transmission device is sleeved on the harrow handle assembly and is connected with the harrow handle assembly in a screwing manner.

According to one aspect of the invention, the method further comprises the following steps: the fixed sealing blocks are arranged at the two ends of the measuring rake in the length direction, and the detachable blocks are abutted against the fixed sealing blocks and can be spliced;

the fixed sealing block comprises: a first blockout portion and a second blockout portion;

the first blocking part is positioned on the upper side of the second blocking part, and the side surface of one side of the first blocking part, which is adjacent to the second blocking part, is matched with the shape of the upper surface and the lower surface of the measuring rake in the thickness direction;

sealing elements are respectively arranged between the first blocking part and the second blocking part and between the first blocking part and the upper surface and the lower surface of the measuring rake.

According to one aspect of the invention, the rake body is slidably arranged relative to the fixed sealing block;

the rake body is made of stainless steel.

In order to achieve the above object, the present invention provides a method for preparing the above high spatial resolution movable pitot-pressure measuring rake, comprising:

s1, selecting stainless steel plates with preset sizes to perform machining so as to obtain a main body, a cover plate, a first side plate and a second side plate of the rake body;

s2, positioning and installing the pressure probe and the guide pipe on the rake body, and injecting glue into an installation groove of the main body to fix the pressure probe and the guide pipe;

and S3, installing a harrow handle component and a moving component at one end of the harrow body in the length direction.

According to one scheme of the invention, the invention can be suitable for the fields of wind tunnels, ejectors, engines and the like which need to perform flow field detection, has the characteristic of high spatial resolution, and has the advantages of flexible movement, large detection range, high measurement efficiency, convenient data reading and low manufacturing cost.

According to one scheme of the invention, the Pitot pressure measurement rake can realize transverse and flow direction movement in a flow field through transverse movement and flow direction block exchange, the measurement range is expanded, and meanwhile, the position of a space detection point in the flow field of each probe on the measurement rake is conveniently read through the transverse movement assembly and the flow direction positioning scale, so that the post-processing of test data is facilitated.

According to one scheme of the invention, the flow direction moving distance can realize accurate capture of the flow field inflection point position through graded block matching. In addition, the measuring rake does not process the probe and the internal air duct of the rake body respectively, but uses the mature capillary tube to glue with the rake body, the welding is avoided, the adverse effect caused by the welding on the deformation of the probe and the rake body is reduced, the levelness of the probe, the transverse center distance of the probe, the longitudinal dislocation control of the probe is well guaranteed, the transverse measuring precision of the measuring rake is improved, the difficulty of the processing of the measuring rake is reduced, meanwhile, the utilization efficiency of the internal space of the rake body is improved, more catheters can be accommodated, and then the upper limit of the number of the probes can be obtained, the measuring rake can obtain flow field data which is more rich than the traditional method when the single measurement is carried out, and the measuring efficiency is greatly improved.

According to one scheme of the invention, the measuring rake adopts a smaller probe size to be matched with a matched blocking block group, a transverse moving assembly and a flow direction positioning graduated scale, so that higher flow field resolution can be obtained.

Drawings

FIG. 1 schematically illustrates a front view of a high spatial resolution mobile pitot pressure measurement rake according to one embodiment of the present invention;

FIG. 2 schematically illustrates a block diagram of a measurement rake according to one embodiment of the present invention;

fig. 3 schematically shows a block diagram of a body in a rake body according to an embodiment of the invention;

fig. 4 schematically illustrates a bottom view of a body in a rake body according to an embodiment of the invention;

fig. 5 schematically shows a block diagram of a conduit arranged inside a body in a rake body according to an embodiment of the invention;

fig. 6 schematically shows a construction of a cover plate in a rake body according to an embodiment of the invention;

fig. 7 schematically shows a construction of a first side plate in a rake body according to an embodiment of the invention;

fig. 8 schematically shows a construction of a second side plate in a rake body according to an embodiment of the invention;

FIG. 9 schematically illustrates a block diagram of a mobile assembly in accordance with one embodiment of the invention;

FIG. 10 schematically illustrates a block diagram of a fixed sealing block according to an embodiment of the present invention;

fig. 11 schematically shows a cross-sectional view of a fixed sealing block according to an embodiment of the invention;

FIG. 12 schematically illustrates an assembly view of a high spatial resolution mobile Pitot pressure measurement rake and a flow field body, in accordance with one embodiment of the present invention;

FIG. 13 schematically illustrates a simulation of a high spatial resolution mobile pitot pressure measurement rake flowing in a flow field at 1.2Ma in accordance with one embodiment of the present invention;

fig. 14 schematically illustrates a simulation of a high spatial resolution mobile pitot pressure measurement rake flowing in a flow field at 2Ma in accordance with one embodiment of the present invention.

Detailed Description

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.

In describing embodiments of the present invention, the terms "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer" are used in an orientation or positional relationship that is based on the orientation or positional relationship shown in the associated drawings for ease of description and simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated in a particular manner, and thus, are not to be construed as limiting the present invention.

As shown in fig. 1, according to an embodiment of the present invention, the high spatial resolution mobile pitot-pressure measurement rake of the present invention can perform a contact total pressure measurement task for supersonic flow fields such as an ejector, a wind tunnel, an engine, etc., and has the characteristics of wide flow field, high resolution, high efficiency, low cost, etc. In the embodiment, the pitot-pressure measurement rake can perform measurement at a fixed position (namely, the measurement rake is fixed in a certain or certain typical flow field characteristic position area of a flow field, so that performance parameters of related equipment can be obtained), and can also perform measurement in an area range (richer and comprehensive data can be obtained, the pitot-pressure measurement rake is suitable for academic research, especially complex flow field detection, simulation calculation results can be verified, and a flow mechanism is revealed).

As shown in fig. 1 and 2, in the present embodiment, the pitot-pressure measurement rake includes: a measuring rake 1 and a rake handle component 2 connected with the measuring rake 1. Wherein, measurement harrow 1 includes: a plate-like rake body 11, a pressure probe 12 provided on one side in the width direction of the rake body 11, and a duct 13 provided in the rake body 11. Along the length direction of harrow body 11, pressure probe 12 is provided with a plurality ofly at equal interval, and pressure probe 12 one end bonds with harrow body 11, and the other end freely extends along the direction of keeping away from harrow body 11. In the present embodiment, the conduits 13 are disposed in one-to-one correspondence with the pressure probes 12, and one end of each conduit is communicated with the pressure probe 12, and the other end of each conduit is selectively extended from one end of the rake body 11 in the length direction; in the present embodiment, the rabble arm assembly 2 is connected to one end of the rabble body 11 in the length direction, and is used for realizing the force application movement of the rabble body 11.

Through the arrangement, the mode of fixing the pressure probe on the rake body in a bonding mode can effectively ensure that the probe has good levelness, effectively prevent longitudinal dislocation in the fixing process and effectively eliminate adverse effects caused by other fixing modes.

According to one embodiment of the invention, the clogging ratio of the measuring rake 1 is less than 0.1. In the present embodiment, the clogging ratio of the measuring rake 1 can be set to 0.05, but of course, other ratios can be set according to actual needs.

Through the arrangement, the thickness of the whole measuring rake 1 is small enough, the problem that the flow field is not started due to the fact that the measuring rake is added can be effectively solved, and effectiveness, stability and reliability of measurement are guaranteed.

Referring to fig. 1 and 2, according to an embodiment of the present invention, diversion angles are respectively disposed on two sides of the rake body 11 in the width direction, and the rake body 11 may be in a flattened hexagonal shape by disposing the diversion angles on two sides of the rake body 11 in the width direction, so as to further adapt to the supersonic flow field under the condition that the blockage ratio is sufficiently low. In this embodiment, the magnitude of the draft angle is: 10-30 degrees. For example, the draft angle of the rake body 11 may be set to 20 °.

The flow guide angle is arranged in the set range, so that the influence of the rake body 11 on the flow field is effectively avoided, the influence of shock waves generated by the rake body on probe measurement is easily caused due to the fact that the flow guide angle is too large, the cross section of the rake body is larger under the same thickness due to the fact that the flow guide angle is too small, the mechanical property of the measurement rake is reduced, and the size of the flow guide angle of the rake body can be selected according to the size of the flow field, the speed of the flow field and the like in the flow field measurement.

In the present embodiment, in order to achieve a sufficiently low blockage ratio of the rake body 11, the thickness (i.e., the windward height) of the rake body 11 may be set as follows: 6 mm-8 mm. The thickness of the rake body 11 is 6mm, for example.

In the present embodiment, the width of the rake body 11 is determined by the diversion angle, the thickness of the rake body and the space of the air duct embedded in the rake body, for example, the width of the rake body 11 can be set to 70mm.

In the present embodiment, the length of the rake body 11 is set according to the need for fluency to be measured, for example, the length of the rake body 11 may be set to 384mm.

Referring to fig. 1, 2, 3, 4, 5, 6, 7 and 8, according to an embodiment of the present invention, the rake body 11 includes: a main body 111, a cover plate 112, a first side plate 113 and a second side plate 114. In the present embodiment, the main body 111 is a plate-shaped body, and one side in the width direction thereof is provided with a mounting passage 111a for mounting the pressure probe 12, and one side in the thickness direction thereof is provided with a mounting recess 111b for accommodating the guide tube 13. In the present embodiment, the mounting groove 111b has a rectangular cross section, and the size thereof is 36mm — 4mm. In the present embodiment, the mounting passage 111a is provided in communication with the mounting groove 111b for enabling communication of the catheter 13 with the pressure probe 12. In the present embodiment, the cover plate 112 is provided in an outer shape conforming to the opening shape of the mounting recess 111b on the main body 111 for closing the mounting recess 111b. In the present embodiment, the mounting grooves 111b have an open arrangement at opposite ends of the main body 111 in the lengthwise direction of the main body 111; and a first side plate 113 and a second side plate 114 are respectively provided at opposite ends of the main body 111 in a length direction of the main body 111.

In the present embodiment, duct passages through which the ducts 13 protrude are arranged on the first side plate 113 and the second side plate 114, and the duct passages can communicate with the mounting groove 111b, so that the end portions of the ducts 13 can be led out and connected to an external sensor. In the present embodiment, the center distance of the flow direction between the duct channels on the first side plate 113 and the second side plate 114 in the width direction of the rake body 11 is set to be 4mm, and the center distance of the up and down between the duct channels on the first side plate 113 and the second side plate 114 in the thickness direction of the rake body 11 is 2.4mm.

In the embodiment, the duct channels on the first side plate 113 and the second side plate 114 can be arranged in a multi-row array manner, so that the end portions of the ducts 13 are arranged up and down in the thickness direction of the rake body 11, and further, the extraction of more ducts 13 can be fully satisfied in a small space, and the compact structure of the invention is ensured.

In the present embodiment, the guide tubes 13 may be replaced with capillary tubes, and the mounting grooves 111b may receive the guide tubes 13 corresponding to the pressure probes 12 one by one, in the present embodiment, since the guide tube passages are formed in both the first side plate 113 and the second side plate 114, the guide tubes 13 may be drawn out by distributing the guide tubes 13 in a close manner.

Referring to fig. 2 and 3, according to an embodiment of the present invention, the main body 111 includes: a flow field immersion portion 1111 for mounting the pressure probe 12, a transition portion 1112, a first clamping portion 1113, and a second clamping portion 1114. In the present embodiment, the transition portion 1112 is provided at each of opposite ends of the flow field immersion portion 1111; the first clamping portion 1113 and the second clamping portion 1114 are respectively connected with the flow field wetting portion 1111 through a transition portion 1112. In the embodiment, the transition portion 1112 is arranged to enable the flow field wetting portion 1111 to have a certain adjusting space in the length direction, to more effectively and accurately adjust the position of the measurement rake 1 relative to the flow field, and to enable the measurement rake 1 of the present invention to have a wider measuring space in the length direction, so that the measurement accuracy of the present invention is ensured, and the flexibility of the present invention in use is effectively improved.

In the present embodiment, in order to achieve that the flow field wetting section 1111 has a sufficient movement space in the longitudinal direction, the length of the transition section 1112 may be set to be 2 times the distance between the centers of the pressure probes 12.

In this embodiment, the length of the flow field immersion 1111 is determined by the measured flow characteristic length, which may be set to 280mm, for example.

In the present embodiment, the cross-sectional shapes of the first clamping portion 1113, the transition portion 1112, and the flow field wetting portion 1111 are kept uniform; the cross-sectional shape of the second clamp 1114 is rectangular. Through setting up second clamping part 1114 into the rectangle form for it is more convenient when measuring the width direction of harrow 1 with installation harrow handle subassembly 2, and can not exert an influence to the water conservancy diversion angle on the harrow body 11, is beneficial to guaranteeing the whole precision of harrow body 11.

Referring to fig. 2 and 3, according to an embodiment of the present invention, a position scale 1112a is disposed on one side surface of the transition portion 1112 in the thickness direction of the main body 111, and the position scales 1112a are arranged in a longitudinal direction of the transition portion 1112. In this embodiment, the number of the scales 1112a can be determined according to the length of the transition segment 1112, so as to achieve an accurate positioning effect when adjusting the position of the rake body 11 along the length direction. In the present embodiment, the distance of spacing between adjacent scales 1112a may be set to 1mm, and of course, the spacing between adjacent scales 1112a may be further reduced in accordance with the movement accuracy so that the movement accuracy thereof is higher.

According to one embodiment of the present invention, the ratio of the length l of the pressure probe 12 to the probe outer diameter D is greater than 12, and the ratio l/D can be increased appropriately when the mechanical properties of the pressure probe 12 are satisfied. For example, the outer diameter of the pressure probe 12 is 1.4mm, the inner diameter is 0.7mm, and the probe overhang length is 25.61mm, so l/D =18.293.

Through the arrangement, the influence of the rake body 11 on the probe is effectively reduced, and the defects that the mechanical property is poor due to the overlong probe, and the measurement precision of the probe is reduced due to the influence of flow field vibration are particularly easily overcome.

In the present embodiment, a plurality of pressure probes 12 will generate mutual interference in the supersonic flow field, and in order to reduce such interference as much as possible, the ratio of the center-to-center distance s between adjacent pressure probes 12 to the outer diameter D of the probes should be greater than 5, and the value of s/D can be properly controlled within a reasonable range in order to improve the detection efficiency of the measurement rake 1. For example, the number of the pressure probes 12 attached side by side in the longitudinal direction of the flow field immersion portion 1111 is 32, the center-to-center distance between adjacent pressure probes 12 is 8mm, and when the outer diameter of the pressure probe 12 is 1.4mm and the inner diameter is 0.7mm, s/D =5.714.

In the present embodiment, the inner diameter d of the pressure probe 12 satisfies: d is more than 0.3mm and less than 1.0mm.

Through the arrangement, the flow field pressure signal can be effectively ensured to be transmitted to the pressure sensor through the pressure probe 12 and the guide pipe 13, and the measurement accuracy is further ensured to be favorable. In addition, through the above arrangement, it is also advantageous to control the size of the pressure probe 12 while ensuring the overall strength of the pressure probe 12.

In this embodiment, when the pressure probe 12 has a large size, one end of the pressure probe, which is far away from the rake body 11, may be set as a conical head, and the vertex angle of the conical head is smaller than 10 °, so that the pressure probe 12 may effectively avoid causing large interference to the flow field, and further, the present invention is beneficial to ensuring the stability of the flow field and the measurement accuracy. In addition, when the probe size is less, its one end of keeping away from harrow body 11 can set up to blunt, and then can guarantee its structural strength, can further effectively guarantee small-size pressure probe's measurement accuracy.

In the present embodiment, the pressure probe 12 may be made of a material having a large elastic modulus and high toughness, for example, stainless steel.

Through the arrangement, the overall mechanical performance of the pressure probe 12 can be effectively ensured, and the measurement precision and the measurement stability of the invention are further ensured.

In this embodiment, the conduit 13 is sized to fit the pressure probe 12 for connection to the pressure probe 12. For example, in the case where the pressure probe 12 is provided with an outer diameter of 1.4mm and an inner diameter of 0.7mm, the outer diameter of the guide tube 13 is correspondingly provided with 1.4mm and the inner diameter is provided with 0.7mm.

Referring to fig. 1 and 2, according to one embodiment of the present invention, the rabble arm assembly 2 includes: an annular connecting portion 21 and a rod-shaped shank portion 22 connected to the annular connecting portion 21. In the present embodiment, the annular connecting portion 21 and the rod-shaped handle portion 22 are disposed coaxially, and an opening is formed on a side of the annular connecting portion 21 away from the rod-shaped handle portion 22, and the width of the opening is identical to the width of the second clamping portion 1114, so as to facilitate the fixed connection between the annular connecting portion 21 and the second clamping portion 1114. In this embodiment, the second clamping portion 1114 has a rectangular block shape, so that the structure is more stable and reliable, and the fixed connection with the annular connecting portion 21 can be conveniently realized. In the present embodiment, the annular connecting portion 21 and the second clamping portion 1114 are connected by welding.

In the present embodiment, the rod-shaped shank 22 has a diameter of 10mm and a length of 84mm.

Through the arrangement, the handle assembly is simple in structure and reliable in use, can be used for moving the measuring rake independently, can be matched with other structures for use, and ensures the flexibility of use.

Referring to fig. 1 and 9, according to an embodiment of the present invention, the high spatial resolution mobile pitot-pressure measurement rake further comprises: the assembly 3 is moved. In this embodiment the moving assembly 3 is detachably connected to the rabble arm assembly 2. Wherein the moving assembly 3 comprises: the connecting body 31, the screw transmission 32 rotatably connected with the connecting body 31, the connecting bracket 33 connected with the connecting body 31, and the guide rail 34 slidably connected with the connecting bracket 33. In the present embodiment, the connecting body 31 is a hollow cylindrical body, and connecting supports are provided at opposite ends in the radial direction thereof for connection with the connecting brackets 33. In the present embodiment, the connecting bracket 33 is a rod-shaped body having an elongated shape, one end of which is bent to be connected to the connecting support member of the connecting body 31, and the other end of which is provided with a positioning slider slidably connected to the guide rail 34. In this embodiment, two guide rails 34 are disposed in parallel up and down, and the extending direction of the guide rails is parallel to the width direction of the rake body 11, so that the measuring rake can be driven by the driving action of the moving assembly 3 to move along the guide rails to realize the position adjustment. In the present embodiment, in order to mark the position of the rake body 11 in the direction of the guide rails 34, a flow direction positioning scale a (see fig. 12) may be provided on one of the guide rails 34 or at an adjacent position, and a flow direction positioning pointer b (see fig. 9) may be provided at an end of the adjacent connecting bracket 33, thereby realizing position marking in the flow direction (i.e., the width direction of the rake body 11).

In this embodiment, the screw transmission device 32 is also hollow cylindrical, and thus can be conveniently and rotatably connected with the connecting body 31 coaxially, and further, after the hollow part of the screw transmission device 32 is connected with the rod-shaped handle 22 of the rake handle assembly 2, the rake handle assembly 2 can be rotated to push the rake body 11 to move along the length direction (i.e. perpendicular to the flow direction) by rotating the screw transmission device 32. In this embodiment, the screw drive 32 is threadedly connected to the rabble arm assembly 2. In the present embodiment, when the position of the rake body 11 in the length direction is adjusted by the screw transmission device 32, the position of the rake body 11 in the direction of the flow direction can be kept stationary by fixing the connecting bracket 33 and the guide rail 34, so as to adjust the position of the rake body 11 in the length direction. In the present embodiment, when the rake body 11 is adjusted in the longitudinal direction, the position can be accurately adjusted in accordance with the position scale 1112a on the transition portion 1112.

Referring to fig. 1, 10 and 11, according to an embodiment of the present invention, the high spatial resolution mobile pitot pressure measurement rake further comprises: the fixed sealing blocks 4 are arranged at the two ends of the measuring rake 1 in the length direction, and the detachable blocks 5 are abutted against the fixed sealing blocks 4 and can be spliced. In the present embodiment, the fixed packing 4 includes: a first block portion 41 and a second block portion 42; wherein, the first block part 41 is positioned at the upper side of the second block part 42, and the side surface of the adjacent side of the first block part 41 and the second block part 42 is matched with the shape of the upper and lower surfaces of the measuring rake 1 in the thickness direction. In the present embodiment, sealing members are provided between the first block portion 41 and the second block portion 42, and between the first block portion 41, the second block portion 42, and the upper and lower surfaces of the measurement rake 1, respectively. Specifically, when the fixed seal block 4 is coupled to the first holding portion 1113, the loop shape formed when the first block portion 41 and the second block portion 42 are butted against each other matches the outer shape of the first holding portion 1113, and a seal member (e.g., a gasket) is provided between the positions where the first block portion 41 and the second block portion 42 are in contact with the first holding portion 1113, and in addition, to prevent leakage from occurring at the positions where the first block portion 41 and the second block portion 42 are butted against each other, a seal member (e.g., a gasket) is also provided at the position where the first block portion 41 and the second block portion 42 are butted against each other. After the butt joint of the first block portion 41 and the second block portion 42 is completed, the first block portion 41 and the second block portion 42 are fixed in series by using the locking connector. Similarly, the connection manner of the first blocking portion 41 and the second blocking portion 42 with the second clamping portion 1114 is the same as the above-mentioned manner, and further description is omitted.

In this embodiment, the removable block 5 is spliced against the fixed sealing block 4 in the direction of the flow field to effect a seal in the direction of the flow field. In this embodiment, the number of the detachable plugs 5 is selected according to the length of plugging required, and of course, the length of the detachable plugs 5 is preset, and the splicing can be realized by a flexible combination. In this embodiment, the removable block 5 has various sizes, which can be divided into: the number of the plugging blocks at each level is at least one, and then selective splicing can be carried out at the position to be plugged. In this embodiment, each removable block 5 may be provided with a threaded hole or a pull ring to facilitate its removal and installation. It should be noted that, when the position of the rake body 11 is adjusted along the flow field direction, the installed detachable block 5 needs to be detached first before moving, and after the moving is completed, the adaptive detachable block 5 is selected to plug the vacant position.

Through the arrangement, the mode of installing and fixing the sealing and blocking block on the rake body can ensure that the measurement rake is stably installed, and meanwhile, the stable movement in the flow field direction can be realized, so that the installation precision and the installation air tightness are ensured, and the measurement precision of the invention is beneficial to ensuring. In addition, can further convenient measurement harrow front and back of flowing field direction seal the shutoff through setting up removable sprue 5, form along the removal space of flow direction through the dismantlement combination of removable sprue 5, will measure the harrow and carry out the flow direction along the slide rail and remove again, and both cooperations can accomplish the measurement work to measuring section basin.

As shown in fig. 1, according to an embodiment of the present invention, the rake body 11 may be made of a material with a large elastic modulus and high toughness, such as stainless steel.

Through the arrangement, the overall mechanical performance of the rake body 11 can be effectively ensured, and the measurement accuracy and the measurement stability of the invention are further ensured.

Referring to fig. 1 to 11, according to an embodiment of the present invention, a method for manufacturing the high spatial resolution movable pitot pressure measurement rake includes:

s1, selecting stainless steel plates with preset sizes to perform machining so as to obtain a main body 111, a cover plate 112, a first side plate 113 and a second side plate 114 of the rake body 11. In the present embodiment, the method specifically includes the following steps:

s11, processing a whole stainless steel material block into a 380mm 70mm 8mm plate, reserving 2mm of allowance for subsequent processing in the thickness direction, performing grinding finish machining positioning after convenient assembly, and keeping good finish on each processing surface to ensure that the whole rake body can reach preset processing precision.

S12, the obtained plate is clamped and positioned by using the clamping blocks, the hole position for fixing the pressure probe 12 on the windward end face is positioned and processed by taking the upper end face of the plate as a reference face, the hole diameter allowance is set to be 0.2mm, namely the hole diameter is 1.6mm, and 32 holes are drilled in total in order to ensure that the holes can reach the inner cavity of the rake body and have the depth of about 40mm in order to ensure that the subsequent pressure probes 12 can be inserted into the hole position.

S13, fixing the punched plate on a processing platform, roughly processing a molded surface by using a milling machine or a planer, reserving a margin of 0.2mm, changing a finish processing cutter, reducing the feeding amount of the cutter, or carrying out finish processing by using the grinding machine to ensure that the molded surface of the plate meets the requirements of finish and tolerance of the processing requirement, respectively carrying out flow guide angle processing on two sides of the width direction of the plate, and stopping processing until the flow guide angle is 15mm away from the right end face to form a second clamping part 1114, wherein the second clamping part is used for mounting the harrow handle component 2 and can play a role in limiting the movement of the measurement harrow 1 along the length direction.

And S13, clamping the plate subjected to the previous step of processing on a platform, roughly milling the general shape of the mounting groove 111b, and then finely milling to enable the plate to meet the design size requirement.

S13, fixing the plate processed by the cavity groove on a milling machine, milling the upper allowance and the lower allowance by 0.8mm, chamfering the windward diversion angle and the leeward diversion angle, wherein the fillet is R =0.1mm, and moving to a grinding machine to finish machining and positioning the upper allowance and the lower allowance of 0.2 until the plate meets the design requirement.

S14, scale forming is carried out on the upper end face of the plate transition portion 1112 in a laser or electric spark mode, the interval between scale lines is 1mm, and 26 lines are arranged on the left side and the right side respectively so as to ensure that the position of the measuring rake can be conveniently read when the plate transition portion is moved in the length direction. The upper end face of the guide plate can be guaranteed to have better flatness by laser forming processing, so that the measuring rake is continuously and smoothly contacted with the fixed sealing block 4 when moving in the length direction, and simultaneously, the scale marks partially immersed in the flow field cannot influence the flow field.

At this point, the column 111 of the rake body 11 is finished.

S15, taking a plate, cutting out a general shape required by a design, positioning the plate, processing a conduit channel according to the design size, and finally adopting a finish milling mode to enable the conduit channel to meet the design requirement without special requirements on the surface. After the processing is finished, the hole positions of the side plates are marked by using the marking pen, so that the subsequent assembly of the air guide pipeline is facilitated.

At this point, the first side plate 113 and the second side plate 114 are finished.

S16, cutting the plate to obtain a plate matched with the opening shape of the mounting groove 111b, milling a 10-degree inclination angle at the end part of the buckling side, wherein the thickness of the whole plate is 1mm, and performing surface finish treatment to keep the plate surface to have good flatness and finish.

At this point, the cover plate 112 is finished.

S2, positioning and installing a pressure probe 12 and a guide pipe 13 on the rake body 11, and injecting glue into an installation groove 111b of the main body 111; in the present embodiment, the method specifically includes the following steps:

s21, because the length-diameter ratio l/D of the pressure probe 12 is required to be more than or equal to 12, the ratio of the center distance s between the probes to the outer diameter D of the probe is required to be more than 5, the wall thickness of the probe is required to be enough to ensure that the mechanical property of the probe is enough, the probe cannot vibrate in a flow field and can bear the impact of the flow field, and in order to ensure that a flow field pressure signal can smoothly enter a pressure sensor through the pressure probe and a guide pipe to be received, the inner diameter of the pressure probe is required to be ensured to meet the requirement that D is more than 0.3mm and less than 1.0mm; in the present embodiment, the pressure probe 12 is a stainless steel capillary tube having an outer diameter of 1.4mm, a wall thickness of 0.7mm, and an inner diameter of 0.7mm.

In the embodiment, the pressure probe 12 is clamped by the tool, and the pressure probe 12 is connected with the rake body 11 in a bonding mode, so that the good levelness of the pressure probe 12 is ensured, and the longitudinal dislocation is reduced. Specifically, the pressure probe 12 is shaped, so that the flow channel in the capillary tube is prevented from being blocked due to machining in the shaping process. The shaped pressure probe 12 is numbered and inserted into a guide plate, and a clamping tool is utilized to fix the probe part, so that the probe part has good levelness and no longitudinal dislocation; and then, welding positioning is carried out on the inner side of the cavity (during welding, cold joint can be carried out, the condition that the capillary does not slide during subsequent treatment and is not influenced by welding to cause blockage of an inner flow channel is ensured), then the guide pipes 13 are respectively led to guide pipe channels of the side plates on two sides according to preset routing, certain 10-30 mm allowance is reserved to be used as leading-out measurement interfaces, and the two side plates are fixed on two sides of the column body 111 in an adhesive mode. The conduit 13 is arranged, and a margin of 5-10 mm is properly reserved at the front part of the windward end face of the column body 111, so that the final positioning processing is facilitated, and the situation that the design size requirement cannot be met after the shaping is carried out due to dislocation is prevented. Meanwhile, when the guide pipe 13 is treated, a preservative film or a small balloon is used for protecting the port of the guide pipe 13, so that the inner flow passage is prevented from being blocked, and the ventilation of the guide pipe 13 needs to be checked before and after processing.

After the main body 111, the first side plate 113, the second side plate 114, the pressure probe 12 and the guide pipe 13 which are well positioned are fixed, glue is injected into the mounting groove 111b (the glue needs to have good adhesion with a structure and good air tightness at the same time) to be full, the step of the main body 111 at the opening position of the mounting groove 111b is also uniformly coated, the cover plate 112 is closed and positioned and fixed, then the main body 111 and the cover plate 112 are clamped and fixed by a tool in a plurality of point positions (the upper surface and the lower surface of the main body are all subjected to conditional) until the glue is cured, and the flatness of the rake main body is guaranteed to be good.

Thus, the entire rake body 11 is completed.

And S3, installing a harrow handle component 2, a moving component 3 and a fixed sealing block 4 at one end of a harrow body 11. In the present embodiment, the method specifically includes the following steps:

s31, in order to conveniently measure the transverse moving of the harrow 1 (namely the length direction of the harrow body 11), acting force needs to be applied by a harrow handle component, so that the harrow body needs good mechanical property, and meanwhile, in order to ensure the controllability in the transverse moving process, a thread feeding mode is adopted, so that the balance controllability of the transverse moving force can be realized; in order to facilitate the cooperation with the automatic assembly, the rabble arm assembly 2 needs to ensure good centrality;

in order to avoid deformation influence on the end part of the rake body 11, particularly the upper end surface and the lower end surface, and facilitate the air guide pipeline interface not to be interfered when the rake handle assembly 2 is connected with the rake body 11, the air guide pipeline interface is designed into a forked shape (namely, an annular shape with an opening) and then is connected with a windward platform and a leeward platform of the rake body 11;

in the present embodiment, the diameter of the rod-shaped shank 22 is 10mm, the length of the thread on the rod-shaped shank 22 is set to ensure the maximum lateral movement of the rake, the diameter of the annular connecting portion 21 is 6mm, and the distance from the rod-shaped shank 22 to the end face of the side plate of the rake body 11 is 107mm. The annular connecting part 21 is required to have good welding strength during processing, and the rake body 11 is not deformed obviously. And (3) carrying out shaping, positioning and fine machining on each machined surface of the rake body 11, and removing the machining allowance before so as to enable the machined surface to meet the design requirement: the surface of the main body 111 and the lower cover plate 112 is ground, and the protruding guide pipe 13 is cut with a margin.

Based on the scheme, the obtained measurement rake is tested and simulated to be verified. Specifically, as shown in fig. 13, simulation verification is performed from three aspects of the rake body 11, the probe and the probe, and the probe interference in the 1.2Ma incoming flow state, and as shown in fig. 14, simulation verification is performed from three aspects of the rake body 11, the probe and the probe, and the probe interference in the 2Ma incoming flow state.

As shown in fig. 13 and 14, when the total pressure is measured, the bow shock waves generated by the pressure probes in the supersonic flow field do not hit the lips of the opposite side, which leads to measurement errors, and the outward-push oblique shock waves generated by the flow guide plate do not interfere with the pressure probe extending forwards, so that the reasonable design can be demonstrated, and the sample piece can be processed in the factory, which has an ideal effect. Consistent with the design expectations.

According to the invention, the measuring rake adopts an industrially mature capillary tube and rake body to replace the original multi-section welding form through glue bonding, so that the adverse effect on the deformation of the probe and rake body caused by welding is eliminated, the levelness of the probe, the transverse center distance of the probe and the longitudinal dislocation control of the probe are well ensured, and the transverse measuring precision of the measuring rake is improved.

According to the invention, the space precision of the measuring rake is improved from 2mm to 1mm. Meanwhile, the process difficulty is reduced, the mature capillary tube is low in purchase price and high in machinability, and compared with the original probe, the capillary tube has smaller structure size and good structure applicability, so that more pipelines can be arranged in the measuring rake body, the measuring rake can further have more probes, 32 space points can be measured simultaneously through single measurement, and the measuring efficiency is greatly improved compared with the original only 10 space points; accurate measurement can be achieved for the areas, such as transition points of a flow field and mixed layer shock wave expansion wave interference, in the flow field, of which the flow direction interval is 60mm, wherein the areas are caused by a plurality of inflection points and completely covered by main flow, of secondary flow.

According to the invention, the matched detachable blocking blocks are designed in a grading way to form the blocking block groups of 200mm grade, 100mm grade, 50mm grade, 20mm grade, 10mm grade and 5mm grade, so that the measuring rake can be ensured to have more abundant moving modes along the flow direction, and the accurate catching of the position of an inflection point is further realized.

According to the invention, the measuring rake can realize accurate position adjustment in the transverse direction through the spiral rotating structure, and meanwhile, the moving position is accurately read through the scales; in addition, the detachable block group can realize that the measuring rake moves along the flow direction, the flow direction measurement of the flow field is completed, the measuring range is expanded, meanwhile, the diversification of the flow direction movement is realized through the combination of the multiple stages of blocks, and further, the accurate detection of characteristic points of the flow field, such as an inflection point, a secondary flow covering position and the like, is realized.

According to the invention, the small-size and large-quantity pressure probes are arranged on the measuring rake, so that the skin support pressure data of the flow field can be measured efficiently with high spatial resolution; in addition, the fixed sealing block can ensure the sealing performance of relative motion when the measuring rake moves transversely, and is a support for supporting the flow direction movement of the measuring rake.

According to the invention, the structure of the measuring rake is replaced by the capillary tubes such as the pressure probes, the internal air guide pipeline and the measuring interface, so that the processing difficulty of the internal air guide pipeline of the measuring rake is reduced, the space utilization efficiency in the measuring rake is improved, the arrangement quantity of the pressure probes is further improved, and the overall measuring efficiency and resolution of the measuring rake are improved.

According to the invention, a new process is adopted during processing and manufacturing, and a glue injection (such as resin and the like) filling process is adopted inside the structures of the measuring rake body, the probe, the gas guide pipeline, the lower cover plate and the like, so that welding is avoided, the adverse effect on the deformation of the probe and the rake body caused by welding is reduced, the levelness of the probe, the transverse center distance of the probe and the longitudinal dislocation control of the probe are well ensured, the transverse measuring precision of the measuring rake is improved, the processing difficulty of the measuring rake is reduced, and the sealing performance and the loading capacity of the measuring rake are ensured.

In addition, the glue injection process is carried out in the packaging of the rake body of the measuring rake, so that the problem of air tightness inside the measuring rake is fundamentally solved, and a reliable hard inner core is formed inside the solidified glue, so that the problem of too weak loading capacity caused by too thin upper and lower wall surfaces is effectively solved.

The foregoing is merely exemplary of particular aspects of the present invention and devices and structures not specifically described herein are understood to be those of ordinary skill in the art and are intended to be implemented in such conventional ways.

The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. The utility model provides a portable skin of high spatial resolution holds in palm pressure measurement harrow which characterized in that includes: the measuring rake (1) and a rake handle component (2) connected with the measuring rake (1);

the measuring rake (1) comprises: a plate-shaped rake body (11), a pressure probe (12) provided on one side in the width direction of the rake body (11), and a duct (13) provided in the rake body (11);

a plurality of pressure probes (12) are arranged at equal intervals along the length direction of the rake body (11), one end of each pressure probe (12) is bonded with the rake body (11), and the other end of each pressure probe freely extends along the direction far away from the rake body (11);

the guide pipes (13) and the pressure probes (12) are arranged in a one-to-one correspondence manner, one end of each guide pipe is communicated with the pressure probes (12), and the other end of each guide pipe can be selectively arranged at one end of the rake body (11) in the length direction in a protruding manner;

the harrow handle component (2) is connected with one end of the harrow body (11) in the length direction.

2. The high spatial resolution mobile pitot-pressure measurement rake according to claim 1, wherein the blockage ratio of the measurement rake (1) is less than 0.1.

3. The high spatial resolution mobile Pitot pressure measurement Harrow as claimed in claim 2, wherein two sides of the Harrow body (11) in the width direction are respectively provided with a diversion angle, and the diversion angles are as follows: 10 to 30 degrees;

the thickness of the rake body (11) is as follows: 6 mm-8 mm.

4. The high spatial resolution mobile pitot-pressure measurement rake of claim 3, wherein the ratio of the length/of the pressure probe (12) to the probe outer diameter D is greater than 12;

the ratio of the center distance s between adjacent pressure probes (12) to the probe outer diameter D is larger than 5;

the inner diameter d of the pressure probe (12) satisfies: d is more than 0.3mm and less than 1.0mm;

the end of the pressure probe (12) far away from the rake body (11) is a conical head, and the vertex angle of the conical head is smaller than 10 degrees, or the end of the pressure probe (12) far away from the rake body (11) is a blunt head.

5. The high spatial resolution mobile pitot pressure measuring rake according to claim 4, wherein said rake body (11) includes: a main body (111), a cover plate (112), a first side plate (113) and a second side plate (114);

the main body (111) is a plate-shaped body, one side of the main body in the width direction is provided with an installation channel (111 a) for installing the pressure probe (12), and one side of the main body in the thickness direction is provided with an installation groove (111 b) for accommodating the guide pipe (13);

the mounting channel (111 a) is communicated with the mounting groove (111 b);

the shape of the cover plate (112) is consistent with the shape of the opening of the mounting groove (111 b) on the main body (111) and is used for closing the mounting groove (111 b);

the mounting grooves (111 b) have an arrangement that is open at opposite ends of the main body (111) in a length direction of the main body (111);

the first side plate (113) and the second side plate (114) are respectively arranged at two opposite ends of the main body (111) along the length direction of the main body (111);

the first side plate (113) and the second side plate (114) are provided with conduit channels for the conduit (13) to extend out.

6. The high spatial resolution mobile pitot pressure measurement rake of claim 5, wherein the main body (111) comprises: a flow field wetting part (1111) for mounting the pressure probe (12), a transition part (1112), a first clamping part (1113) and a second clamping part (1114);

the transition parts (1112) are respectively arranged at two opposite ends of the flow field wetting part (1111);

the first clamping part (1113) and the second clamping part (1114) are respectively connected with the flow field wetting part (1111) through the transition part (1112);

the cross-sectional shapes of the first clamping part (1113), the transition part (1112) and the flow field wetting part (1111) are kept consistent;

the cross section of the second clamping part (1114) is rectangular;

along the thickness direction of main part (111), be provided with position scale (1112 a) on the one side of transition portion (1112), and position scale (1112 a) arranges along the length direction of transition portion (1112).

7. The high spatial resolution mobile Pitot pressure measurement Rake of claim 6, further comprising: a moving assembly (3);

the moving assembly (3) is detachably connected with the harrow handle assembly (2);

the moving assembly (3) comprises: the device comprises a connecting body (31), a spiral transmission device (32) rotationally connected with the connecting body (31), a connecting bracket (33) connected with the connecting body (31), and a guide rail (34) slidably connected with the connecting bracket (33);

the spiral transmission device (32) is sleeved on the harrow handle component (2) and is connected with the harrow handle component (2) in a screwing mode.

8. The high spatial resolution mobile pitot pressure measurement rake of claim 7 further comprising: the fixed sealing blocks (4) are arranged at the two ends of the measuring rake (1) in the length direction, and the detachable blocks (5) are abutted against the fixed sealing blocks (4) and can be spliced;

the fixed sealing block (4) comprises: a first block portion (41) and a second block portion (42);

the first block part (41) is positioned on the upper side of the second block part (42), and the side surface of one side, adjacent to the second block part (42), of the first block part (41) is matched with the shape of the upper surface and the lower surface of the measuring rake (1) in the thickness direction;

sealing elements are respectively arranged between the first block part (41) and the second block part (42) and between the first block part (41), the second block part (42) and the upper surface and the lower surface of the measuring rake (1).

9. The high spatial resolution mobile pitot-pressure measurement rake according to any one of claims 1 to 8, wherein the rake body (11) is slidably arranged relative to the fixed seal block (4);

the rake body (11) is made of stainless steel.

10. A method of making a high spatial resolution mobile pitot pressure measurement rake as claimed in any one of claims 1 to 9 comprising:

s1, selecting stainless steel plates with preset sizes to perform machining so as to obtain a main body (111), a cover plate (112), a first side plate (113) and a second side plate (114) of the rake body (11);

s2, positioning and mounting the pressure probe (12) and the guide pipe (13) on the rake body (11), and injecting glue into a mounting groove (111 b) of the main body (111) to fix the pressure probe (12) and the guide pipe (13);

s3, a harrow handle component (2) and a movable component (3) are arranged at one end of the harrow body (11) in the length direction.